Well I think you mean that more RAM will mean that your system will run faster, and that is why you want to get it. without starting a Master Class more RAM is only needed if A) you play a video and the system crashes {easy}, or B) your 'commit charge' in Task Manager Performance is higher than the figure of Memory available 'physical memory available' {not so easy}. If this is close enough save your money and put it towards a better cpu and/or motherboard!
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in Task Manager Performance is higher than the figure of Memory available 'physical memory available' 
